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Markus Sieber serves as a member of the advisory board and chairman of the management at SPIRIT/21 GmbH since September 2014, specializing in business development and strategy consulting with a focus on developing new business opportunities. Additionally, Markus Sieber has been involved with the IZF Initiative Zukunftsfähige Führung e.V. as a member since January 2022. Markus Sieber holds a Realschulabschluss from the Böblingen Kaufmännisches Schulzentrum.